Electrochemistry and ion concentration, Chemistry

Assignment Help:

ELECTROCHEMISTRY AND ION CONCENTRATION

Activity dependence of cell voltage:

Measurement of galvanic cell potentials away from the standard state provides a convenient method for measuring ion activity and activity coefficient. As ion concentration is varied in a half-cell to vary ion activity. Equilibrium position of the half cell reduction reaction changes and that causes a change in the half-cell potential. The relationship between the activity and half-cell potential is given by the Nernst equation:

890_electrochemistry.png

for the general half-cell reduction reaction:

 aA+bB+ne-→cC+dD

Cells at equilibrium:

When a cell is at equilibrium, Ecell=0 (the 'flat battery' condition) and Q=K, the equilibrium constant for the reaction (see Topic C1). This gives the expression: which allows calculation of equilibrium constants (see Topic C1) for cell reactions from calculated or measured values.

 

199_electrochemistry1.png

which allows calculation of equilibrium constants for cell reactions from calculated or measured 1046_electrochemistry2.png values.


Related Discussions:- Electrochemistry and ion concentration

Conversions, acetaldehyde to cronic acid

acetaldehyde to cronic acid

Reformatsky reaction - aldehydes and ketones, Reformatsky reaction - Aldehy...

Reformatsky reaction - Aldehydes and Ketones Reformatsky reaction has the treatment of aldehyde and ketone along with a bromo acid ester in existence of metallic zinc to form -

Actinide, #actinide contraction

#actinide contraction

List of common functional groups, Consult the inside front cover of the tex...

Consult the inside front cover of the text for a list of common functional groups. (a) nitrile (b) ether

THERMODYNAMICS, LIMITATION OF THIRD LAW OF THERMODYNAMICS

LIMITATION OF THIRD LAW OF THERMODYNAMICS

Explain the effects of temperature on multicomponent systems, Explain the E...

Explain the Effects of Temperature on multicomponent systems? For some of the derivations in this chapter, we will need an expression for the rate at which the ratio μ i /T var

Physical properties of alkyl cyanides, Physical properties of Alkyl cyanide...

Physical properties of Alkyl cyanides (1) Alkyl cyanides are neutral substance with pleasant odour, similar to bitter almonds. (2) Alkyl cyanides are Lower members containin

What concentration of b alone is increased to three times, A reaction is of...

A reaction is of first order in reactant A and of second order in reactant B. How is the rate of this reaction affected when (i) the concentration of B alone is increased t

Biological or a physical-chemical treatment, A) Explain the purposes of equ...

A) Explain the purposes of equalization basins, grit chambers, primary sedimentation tanks, and waste stabilization ponds in wastewater treatment. B) Would you consider a biolog

Principle of atomic fluorescence spectrometry, Principle of atomic fluoresc...

Principle of atomic fluorescence spectrometry: In AFS, the analyte is converted within gaseous atoms in the ground state using a appropriate atomization technique. These are t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd